Method and apparatus for forming color images by converting a co

Details Method and apparatus for forming color images by converting a co Method and apparatus for forming color images by converting a co

1993-06-18

1995-09-05

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358523, 358515, 358504, G03F 308, H04N 146

Patent

active

054483794

ABSTRACT:
Method and apparatus for forming color images on paper using a sublimation type thermal transfer full-color printer using three color inks of yellow, magenta, and cyan. A color input signal to be printed is subjected to a first color correction process. The first color correction process performs a color correction using linear and non-linear masking operations and produces first ink-density signals. The first ink-density signals are judged for reproducibility by the printer by determining whether the signals fit within a gamut of colors. If judged to be reproducible, the first ink-density signals are passed on to the printer. However, if the first ink-density signals are judged to be outside the gamut of colors, the signals are subjected to a second correction process. The second color correction process first obtains a target color for color reproduction by the printer. Next, the second process sets ink-density signals, obtains predicted colors realized by the ink-density signals, chooses an output ink-density signal such that an evaluation value calculated by the target color and the predicted color becomes minimal, and produces a second ink-density signal that results in optimal colors within the range of colors reproducible by the printer.

REFERENCES:
patent: 4328515 (1982-05-01), Wellendorf
patent: 4959711 (1990-09-01), Hung
patent: 5107332 (1992-04-01), Chan
patent: 5142356 (1992-08-01), Usami

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